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//===-- llvm/Target/TargetOptions.h - Target Options ------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines command line option flags that are shared across various
// targets.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TARGET_TARGETOPTIONS_H
#define LLVM_TARGET_TARGETOPTIONS_H
#include <string>
namespace llvm {
class MachineFunction;
class StringRef;
// Possible float ABI settings. Used with FloatABIType in TargetOptions.h.
namespace FloatABI {
enum ABIType {
Default, // Target-specific (either soft or hard depending on triple, etc).
Soft, // Soft float.
Hard // Hard float.
};
}
namespace FPOpFusion {
enum FPOpFusionMode {
Fast, // Enable fusion of FP ops wherever it's profitable.
Standard, // Only allow fusion of 'blessed' ops (currently just fmuladd).
Strict // Never fuse FP-ops.
};
}
class TargetOptions {
public:
TargetOptions()
: PrintMachineCode(false), NoFramePointerElim(false),
NoFramePointerElimNonLeaf(false), LessPreciseFPMADOption(false),
UnsafeFPMath(false), NoInfsFPMath(false),
NoNaNsFPMath(false), HonorSignDependentRoundingFPMathOption(false),
UseSoftFloat(false), NoZerosInBSS(false), JITExceptionHandling(false),
JITEmitDebugInfo(false), JITEmitDebugInfoToDisk(false),
GuaranteedTailCallOpt(false), DisableTailCalls(false),
StackAlignmentOverride(0), RealignStack(true), EnableFastISel(false),
PositionIndependentExecutable(false), EnableSegmentedStacks(false),
UseInitArray(false), TrapFuncName(""), FloatABIType(FloatABI::Default),
AllowFPOpFusion(FPOpFusion::Standard)
{}
/// PrintMachineCode - This flag is enabled when the -print-machineinstrs
/// option is specified on the command line, and should enable debugging
/// output from the code generator.
unsigned PrintMachineCode : 1;
/// NoFramePointerElim - This flag is enabled when the -disable-fp-elim is
/// specified on the command line. If the target supports the frame pointer
/// elimination optimization, this option should disable it.
unsigned NoFramePointerElim : 1;
/// NoFramePointerElimNonLeaf - This flag is enabled when the
/// -disable-non-leaf-fp-elim is specified on the command line. If the
/// target supports the frame pointer elimination optimization, this option
/// should disable it for non-leaf functions.
unsigned NoFramePointerElimNonLeaf : 1;
/// DisableFramePointerElim - This returns true if frame pointer elimination
/// optimization should be disabled for the given machine function.
bool DisableFramePointerElim(const MachineFunction &MF) const;
/// LessPreciseFPMAD - This flag is enabled when the
/// -enable-fp-mad is specified on the command line. When this flag is off
/// (the default), the code generator is not allowed to generate mad
/// (multiply add) if the result is "less precise" than doing those
/// operations individually.
unsigned LessPreciseFPMADOption : 1;
bool LessPreciseFPMAD() const;
/// UnsafeFPMath - This flag is enabled when the
/// -enable-unsafe-fp-math flag is specified on the command line. When
/// this flag is off (the default), the code generator is not allowed to
/// produce results that are "less precise" than IEEE allows. This includes
/// use of X86 instructions like FSIN and FCOS instead of libcalls.
/// UnsafeFPMath implies LessPreciseFPMAD.
unsigned UnsafeFPMath : 1;
/// NoInfsFPMath - This flag is enabled when the
/// -enable-no-infs-fp-math flag is specified on the command line. When
/// this flag is off (the default), the code generator is not allowed to
/// assume the FP arithmetic arguments and results are never +-Infs.
unsigned NoInfsFPMath : 1;
/// NoNaNsFPMath - This flag is enabled when the
/// -enable-no-nans-fp-math flag is specified on the command line. When
/// this flag is off (the default), the code generator is not allowed to
/// assume the FP arithmetic arguments and results are never NaNs.
unsigned NoNaNsFPMath : 1;
/// HonorSignDependentRoundingFPMath - This returns true when the
/// -enable-sign-dependent-rounding-fp-math is specified. If this returns
/// false (the default), the code generator is allowed to assume that the
/// rounding behavior is the default (round-to-zero for all floating point
/// to integer conversions, and round-to-nearest for all other arithmetic
/// truncations). If this is enabled (set to true), the code generator must
/// assume that the rounding mode may dynamically change.
unsigned HonorSignDependentRoundingFPMathOption : 1;
bool HonorSignDependentRoundingFPMath() const;
/// UseSoftFloat - This flag is enabled when the -soft-float flag is
/// specified on the command line. When this flag is on, the code generator
/// will generate libcalls to the software floating point library instead of
/// target FP instructions.
unsigned UseSoftFloat : 1;
/// NoZerosInBSS - By default some codegens place zero-initialized data to
/// .bss section. This flag disables such behaviour (necessary, e.g. for
/// crt*.o compiling).
unsigned NoZerosInBSS : 1;
/// JITExceptionHandling - This flag indicates that the JIT should emit
/// exception handling information.
unsigned JITExceptionHandling : 1;
/// JITEmitDebugInfo - This flag indicates that the JIT should try to emit
/// debug information and notify a debugger about it.
unsigned JITEmitDebugInfo : 1;
/// JITEmitDebugInfoToDisk - This flag indicates that the JIT should write
/// the object files generated by the JITEmitDebugInfo flag to disk. This
/// flag is hidden and is only for debugging the debug info.
unsigned JITEmitDebugInfoToDisk : 1;
/// GuaranteedTailCallOpt - This flag is enabled when -tailcallopt is
/// specified on the commandline. When the flag is on, participating targets
/// will perform tail call optimization on all calls which use the fastcc
/// calling convention and which satisfy certain target-independent
/// criteria (being at the end of a function, having the same return type
/// as their parent function, etc.), using an alternate ABI if necessary.
unsigned GuaranteedTailCallOpt : 1;
/// DisableTailCalls - This flag controls whether we will use tail calls.
/// Disabling them may be useful to maintain a correct call stack.
unsigned DisableTailCalls : 1;
/// StackAlignmentOverride - Override default stack alignment for target.
unsigned StackAlignmentOverride;
/// RealignStack - This flag indicates whether the stack should be
/// automatically realigned, if needed.
unsigned RealignStack : 1;
/// EnableFastISel - This flag enables fast-path instruction selection
/// which trades away generated code quality in favor of reducing
/// compile time.
unsigned EnableFastISel : 1;
/// PositionIndependentExecutable - This flag indicates whether the code
/// will eventually be linked into a single executable, despite the PIC
/// relocation model being in use. It's value is undefined (and irrelevant)
/// if the relocation model is anything other than PIC.
unsigned PositionIndependentExecutable : 1;
unsigned EnableSegmentedStacks : 1;
/// UseInitArray - Use .init_array instead of .ctors for static
/// constructors.
unsigned UseInitArray : 1;
/// getTrapFunctionName - If this returns a non-empty string, this means
/// isel should lower Intrinsic::trap to a call to the specified function
/// name instead of an ISD::TRAP node.
std::string TrapFuncName;
StringRef getTrapFunctionName() const;
/// FloatABIType - This setting is set by -float-abi=xxx option is specfied
/// on the command line. This setting may either be Default, Soft, or Hard.
/// Default selects the target's default behavior. Soft selects the ABI for
/// UseSoftFloat, but does not indicate that FP hardware may not be used.
/// Such a combination is unfortunately popular (e.g. arm-apple-darwin).
/// Hard presumes that the normal FP ABI is used.
FloatABI::ABIType FloatABIType;
/// AllowFPOpFusion - This flag is set by the -fuse-fp-ops=xxx option.
/// This controls the creation of fused FP ops that store intermediate
/// results in higher precision than IEEE allows (E.g. FMAs).
///
/// Fast mode - allows formation of fused FP ops whenever they're
/// profitable.
/// Standard mode - allow fusion only for 'blessed' FP ops. At present the
/// only blessed op is the fmuladd intrinsic. In the future more blessed ops
/// may be added.
/// Strict mode - allow fusion only if/when it can be proven that the excess
/// precision won't effect the result.
///
/// Note: This option only controls formation of fused ops by the optimizers.
/// Fused operations that are explicitly specified (e.g. FMA via the
/// llvm.fma.* intrinsic) will always be honored, regardless of the value of
/// this option.
FPOpFusion::FPOpFusionMode AllowFPOpFusion;
};
} // End llvm namespace
#endif
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